Vernier dial



A ril 1924. 1,491,370

M. ALDEN VERNIER DIAL Filed Oct. 12 1923 y w /1 1 2??? Z4 74 INVEN TOR.

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Patented Apr. 22, 1924.

UNITED STATES 1,491,310 PATENT OFFICE.

HILTON ALDEN, OF SPRINGFIELD, 'KA SSACHUSETTS.

vmnm DIAL.

a nmm filed October 12,

To all whom It may concern:

Be it known that I, MILTON ALDEN, a citizen of the United States of America, residing at Springfield, county of Hampden, Commonwealth of Massachusetts, have invented certain new and useful Improvements in vemier Dials, of which the following is a specification.

This invention relates to improvements in verniers and particularly to the adjustment of the graduated dial, whereby the tuning of a wireless set may be very accurately accomplished. At the' present time the tuning adjustments are usuall effected by the operator rotating the dial y means of the knob and making these adjustments by observing the graduations on the dial with relation to the graduation on the fixed casing. This is unsatisfactor since the average person cannot make t ese adjustments accurately or close enough in order to bring about a fine degree of tuning.

' By means of my improvement the operator can efl'ect a fine ad ustment without any very great care or attention on his part.

Broadly it comprises a gear attached to the raduated dial and a pinion cooperat-' ing t erewith that may be readily moved so as to mesh with the gear or be withdrawn I therefrom. The diameters of the pinion and gear being such that fine adjustment of the tuning may be obtained for either the resistance or induction coils or the condenser plates. The device is so constructed and arran d that the dial may be adjusted inde n ently of the attachment.

Feferring to the drawings:

. Ffi 1, is a vertical sectional view through the iameter of the dial and a portion of the casing showing the device attached to the dial. I

Fig. 2'is a horizontal sectional view on the line 2--2 of Fig. 1 showing the gear and pinion out of mesh. .7

Fig. 3 is a detail view of the lever which is pivotally attached to the dial and on which the pinion is mounted, and

Fig. 4 is an elevational view of the attachment.

Referring tothe drawings in detail:

1 designates a ortion of the casing which encloses the wire ess apparatus, 2 the vernier dial as a whole on which the. usual raduations are placed. Attached to the dial is a post 3that fits 'into a socket 4 of the operatmgkn'ob portion Sand attached to the post 1923. Serial No. 688,125.

3 is a. shaft 6 by means of the set screw 7 or other suitable device. This shaft passes loosely through the casing 1 and is attached to the inductance coil or to gm movable condenser plates. 8 designat a plate a detail of which is shownin Fig. 3, that is formed with an opening 9 which fits loosely on the post 3. Attached to the plate 8 is the bolt 10 which is attached to the casing 1. The other end of the plate 8 is formed with an elongated slot 11 in which is located the shaft 12 of the pinion 13. Attached to the shaft 12 of the pinion is an operating handle 14 which extends outward beyond the edge of the dial, as shownto permit the operator to move the pinion 13 by means of the handle or post 15. Fixedly secured to the shaft 6 is agear 16 by means of the pin '17 or other suitable means. It will be seen that when the operator moves the handle 14 radially inward the pinion 13 is made to mesh with the gear 16, then b moving the handle 14 either upward or ownward, as

indicated by the arrows 18 in Fig. 2, the

dial 2 may be accurately adjusted and the condenser lates or the inductance or resistance coi s adjusted for accurately tuning the instrument.

It will be noticed that when the pinion 13 is withdrawn from the gear 16 the dial 2 may be adjusted independently by the operatqrturnjng the knob 5'. In operation the link or part 8 remains stationary on the post 3 and the gear 16 when operated b' the pinion 13 turns the gear 16 which rotates the dial 2.

From this description it will" be seen that I have provided a very. simple and inexpensive attachment for adjusting the dials of verniers of a wireless set since the ratio of the diameters of the gear 16 to pinion 13 may be varied in order to increase the fineness of the adjustment. It enables any person to make a very fine adjustment or tuning without carefully observing the graduations.

It will be observed that the part 14 extends outward beyond the edge 19 of the dial. It should also be observed that the handle 14 performs the dual purpose ,for! moving the inion towards and from the gear 16 and or turning the pinion when in engagementwith the gear 16 for adjusting the dial 2.

The instrument may be roughly tuned by turning the dial by means of the knob part 5, then the final or accurate tuning is 'accomplished by moving the gear 13 into mesh; with the gear 16 then, by operating the handle 14 the final tuning is accomplished which 0 erates a resistance or inductance coil or t e movable plates of a condenser. When the dial is turned by hand the post 3 revolves in the openi 9 of the plate 8, the gear 16, when the pinion 13 is out of mesh, turns with the dial 2.

What I claim is:

1. An operating device for adjustably rotating a vernier dial comprising in combination with the dial, a gear attached to the dial, a pinion, a shaft attached to the pinion,'devices for moving the pinion into and out of mesh with the teeth of the gear which consists of a part having an elongated slot to receive the shaft of the pinion, and a part attached to the pinion for rotating the same and extending beyond the outer edge of the dial.

2; An adjusting device for a Vernier dial having in combination with the dial, a post secured thereto, a gear attached to the post, a plate on the post which is attached to a fixed support and formed with an elongated opening, a pinion for engaging the gear, a shaft on the pinion and located in the opening, means attached to the shaft for moving the same in the opening fon moving the pinion into and out of mesh. with the gear, said means serving as a handle to rotate the pinion and dial.

3. An adjusting device for a Vernier dial having a hub part and comprising in combination with the dial, a post attached to the hub part, a shaft attached to the post, means attached to the post, and a art ongaging said means for operating t e same or a justing the dial.

4. In a device for the pur described, the combination with the hu of a dial, a

recessed post attached thereto, an operating shaft attached to the post, a plate formed with an opening to receive the post and havin one end attached to a fixed support and its other and formed with an elongated opening, a gear wheel attached. to the post, a pinion for en aging the gear wheel, and

means attache to the pinion which extends beyond the edge of the dial for operating the gear and turning the dial, said opening permitting the inion to be moved into an out of mesh wit 1 the gear.

5. In a dial adjusting device the combina- 66 the pinion for moving the pinion 60 comprising a gear attached to the dial, a

slidably monntal pinion for e ing the gear, and means for rotating the pinion, said means including a shaft on the pinion, an arm attached to the shaft and a support for the pinion having an elongated opening to 7 receive the shaft MILTON ALDEN. 

